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藻类衍生的溶解有机物的生物降解性及其对植物浮游生物对甲基吸收的影响

Zhike Li¹, Zhengyu Wu¹, Bo Shao¹

¹School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, China.

|June 10, 2023

概括

微生物对溶解有机物 (DOM) 的微生物降解并没有增加植物浮游生物吸收甲基 (MeHg). 相反,降解的DOM更有效地抑制了MeHg的吸收,影响了水生循环.

科学领域:

环境化学环境化学
微生物学微生物学
水生生态学水生生态学

背景情况:

甲基 (MeHg) 是一种强大的神经毒素,其被植物浮游生物吸收是水生食物网的关键途径.
植物浮游生物的MeHg吸收通常被认为随着溶解有机物 (DOM) 度的增加而减少.
微生物对DOM的改变对植物的MeHg吸收的影响仍未得到充分研究.

研究的目的:

研究微生物降解如何影响DOM度和分子组成.
确定微生物改变的DOM对植物浮游生物种Microcystis elabens的MeHg吸收的后续影响.
评估微生物过程在水生食物网底部的甲基循环中的作用.

主要方法:

化藻类衍生的DOM与河流微生物联盟28天.
使用诸如16S rRNA基因测序等技术分析DOM度和分子组成的变化.
在原始和微生物降解的DOM的存在下,Microcystis elabens对MeHg吸收的测量.

主要成果:

微生物降解显著减少了溶解的有机碳 (64.374.1%),并改变了DOM分子组成,使其更像.
类似蛋白质的成分被降解,而细菌代谢物增加了类似的化合物.
尽管减少了DOM,但微生物降解的DOM抑制了Microcystis elabens的MeHg吸收,与对照组相比,它增加了32.752.7%.

结论:

DOM的微生物降解不一定会增强植物浮游生物的MeHg吸收.
微生物改变的DOM可以更有效地抑制植物浮游生物的MeHg吸收.
微生物在DOM降解和改变MeHg吸收中的作用应纳入水生风险评估.

关键词:

由藻类衍生的DOM 在 DOM 中,DOM 描述的特征.生态风险生态风险植物浮游生物吸收的MeHg 微生物降解的降解分子组成分子构成

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